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$ ); echo $? echoed 0,all other shells echo 2.
[unix-history] / usr / src / bin / sh / arith.h
1995-05-05 Christos Zoulasdate and time created 95/05/04 17:59:12 by christos blob | commitdiff
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.